Improvement in hub-borers



UNITE STATES PATENT rFIoE.

ADRIAN o. ABBOTT, or ADRIAN, MICHIGAN.

IMPROVEMENT IN HUB-BORERS.

Specification forming part of Letters Patent No. 146,420, dated January13, 1874; application filed November 1 1873.

To all whom. it may concern:

. Be it known that I, ADRIAN 0. Arrow, of Adrian, in the county of Lenawee and State of Michigan, have invented an Improved Hub- Borer, ofwhich the following is a specification:

The subj cot-matter of this invention is a machine for wagon'makers toset boxes with 5 or, as such machines are termed, a hub-borer ofimproved construction. It is of that class of hub-borers in which thewheel revolves and a non-rotary cutter is supported and fed by a centralshaft. It is also of that sub-class in which the cutter-shaft isadjusted to produce either a cylindrical bore or one more or lesstapering, as required.

The present invention consists, first, in a pcculiar feeding-nutsustaining the same effective position relatively to the adjustableguides of the cutter-shaft at all times, and connected by peculiar meansto the revolving rings so as to work freely therewith, all the effectsof the irregular motion incident to tapcr-borin g being confined to thisconnection; secondly, in the combination of a foundation-ring mounted onthe fixed bearing of the machine; a face-ring furnished with gripes forattaching the wheel; and three equidistant right and leftadjustingscrews, furnished with jam-nuts and applied between theserings, as improved means for truing the wheel.

Figure 1 is a plan view of a hub-borer illustrating this invention. Fig.2 is a vertical longitudinal section of the same in a central plane, awheel, as applied to the machine, being represented indotted lines. Fig.3 is a perspective view, on a larger scale, of the feeding-nut,detached. Fig. 4 is a like view of a .peculiar cutter. Figs. 5 and 6 areelevations of the said cutter and a portion of the cutter-shaft withlongitudinal sections of a hub illustrating the operation of cuttingenlargements in the ends of a hub by means of the improved cutter.

The stationary parts of this machine consist of an annular bearing, A,-attached, by a pair of forked stays, B, to a horizontal base, 0, and .abracket, D, arranged in line with the axis of this bearing behind thesame on the same base.

These parts are securely united by bolts. The. annular bearing A is ofsufficient diameter to receive the largest hubs within it with amarfgin; but in length or depth it is very narrow,

so as at all times to come within the wood of the hub. Mounted on thisbearing is a foundation-ring, E, recessed to embrace the periphcry andthe face of the same, and retained by clip-plates 2 applied to its back.To the foundation-ring E a second ring or annular face-plate, F, isattached by three equidistant right-andleft adjusting-screws, y,furnished with jamnuts 00. This face-ring Fis provided with fastening-bolts or gripes at, having clampingnuts o, the same being appliedto perforated bosses on the face-ring, and constructed with long shaftor bar, H, the front end of which is g screw-threaded, as represented,and furnished with a diagonal socket and a transverse key to receive andsecure a cutter, I, of proper-shape. In the illustration thiscutter-shaft is cylindrical throughout to facilitate its manufacture,and is prevented from turning by a cross-bar, J, applied to its rearend, and sliding on the base 0. The front end of the cutter-shaft isbeveled to form an extension of the throat of the cutter. The guide-boxG is prevented from vertical displacement in its bracket D by crossbarsK, and these are furnished with graduated beveled edges t, to constituteindexes or scales by which to center and adjust the cutter-shaft.

The guide-box is prevented from longitudinal displacement in its bracketby pins 3 engaging with the inner edges of thecross-bars K. For feedingthe cutter-shaft H a peculiar nut, I1, is provided. For the reception ofthis feeding nut a grooved cylindrical neck, 1", is formed on the frontend of the guide-box G, concentric with the cutter-shaft; and: forrevolving the nut a properly bent and braced arm, .M, is attached to therevolving ring E, so as to project rearwardly through the annularbearing A. The feeding-nut L is shown in detail in Fig. 3. It isconstructed with acylindrical cavity, q, and a terminal internalflange,p, at one end, to embrace the grooved bearing-neck r, and with aninternal screw, 0, to engage with the threaded front end of thecutter-shaft. It

is further constructed with a pair of arms, n M, between which aradially-extended slot, m, is formed parallel to the axis of the nut, toreceive the terminal finger m of the revolving arm M. To render thefeeding-nut detachable, it is constructed in two longitudinal partsunited by a hinge which is arranged opposite the arms n M, so that thelatter may project from the respective open edges. A link, I, isattached to one of the arms, at, for uniting the pair to hold the nutclosed, and a locking-pin may be applied in a hole, 70, to secure thesame. To adjust the cutter-shaft H laterally, as required, thumb-screwsi are applied to the sides of the guide-box G at each end throughthreaded perforations, constituting stationary nuts, in the sides of thebracket D. The cutter I,

. for ordinary work, is of a common form. For

1 shoulder, as illustrated in Figs. 5 and 6, and

hereinafter more fully set forth.

In operating this machine the cutter-shaft is first centered, then thewheel is attached, then the hub is centered, then the wheel is trued,then the hole is out.

To center the shaft, the thumb-screws i at the ends of the guide-box Gare turned until center marks on the box are even with the center markson the scales t.

To put the wheel on, the cuttershaft or spindle H is introduced into thecenter hole of the hub, putting the face of the wheel toward themachine, and the wheel is loosely attached by the gripes 20, which areadjusted so as to be in about the same plane or nearly level with eachother.

To center the hub, (by the outside,)' let the operator take one of thegripes w in his hand, holding the spoke beneath firmly against it; seethat the hub appears to be in the center, and then tighten the gripe;then measure the distance between the hub and the stationary bearing A,and, turning the wheel one-half of a revolution, measure again; addone-half of the difference to the smaller measure, and this will givethe distance each part of the hub should be from the bearing in passingany given point; then turn the wheel back to the first position, and putthe hub at the correct distance at that point; then fasten the gripethen turn the wheel one-fourth of a revolution, and set the hub at theproperdistance here by moving the spokes beneath the gripe which has notyet been tightened; then fasten this gripe and the others, and the wheelis centered by its outside.

To center by the hole in the hub, place the gripes level with eachother; fasten one of the gripes w with the cutter-bar H in the center ofthe hub, sighting it from above; then turn the wheel onefourth of arevolution, and center in that position; and then fasten all the gripes.This is the preferred method of centering the hub.

Owing to the peculiar form and arrangement of the fixed bearing A onwhich the wheel rcvolves, a portion of the hub is exposed behind thesame, by observing which the wheel may be quickly centered. Thenecessity for special centering devices is thus obviated, and the use ofany ordinaryscale or pocketrule for this purpose is permitted. Thisconstruction materially reduces the cost of the machine.

To true the wheel, adjust the face plate or ring F by means of the threescrews y until the rim of the wheel runs true.

To bore the hub whena cylindrical bore is desired, turn the wheel withthe revolving rings E F to the left until the operation is completed, acutter of the proper length being used. The rings transmit the motion bythe arm M m to the feeding-nut L m, and the cut ter-shaft is thus fedforward. The cutting of a cylindrical bore is illustrated in Fig. 2.

.When the out is finished the feeding-nut may be opened and removed, andthe shaft quickly slid back.

If a tapering bore is desired, the guide-box G is set at the properangle by means of the adjusting-screws 4i and scales 1?, and theoperation proceeds as in cutting a cylindrical bore.

To cut a suitable bore-enlargement in the back of the hub to receive theflanged inner end of the box, as illustrated in Fig. 5, the cutter I issubstituted for the ordinary cutter, I, when the latter has passedthrough the hub. The cutter-shaft is then adjusted laterally by means ofthe screws '13 for a cut of the proper diameter, and the cutter is fedinward by turn ing the wheel to the right. The operation is concludedwhen an enlargement of the required depth has been produced. Thefeeding-nut is then detached and the cutter forced back and removed. Thecutter-shaft may then be drawn inward preparatory to the next operation.The enlargement thus produced has a round shoulder, or one of the shapeof the main blade h of the cutter, which blade alone acts in thisoperation, or inany other where the cutter-shaft is fed longitudinally.The round shoulder answers perfectly well for this enlargement, and iscut with much less power than a square shoulder.

To cut a bore-enlargement with a square shoulder in the front of the hubto receive the attachingnut, as illustrated in Fig. 6, the out ter 1 isapplied to the cutter-shaft when the latter has been retracted, and,with the feednut L, detached. The wheel is then turned to the right, andthe cutter-shaft is fed later ally by' means of the screws z until therequired diameter of enlargement has been produced. In this operationthe supplemental with the guide-box Gr, having the cylindrical groovedneck 1" to receive the same, as deserlbed, for the purpose specified.

2. The arm Mm and radial slot m, in com-' 'bmation with the swiveledfeeding-nut L, as

means for revolving the same, as set forth.

3. The combination of the foundation-ring E, the face-ring F, carryingthe attachinggripes w o, and the three equidistant right and leftadjusting-screws y, with their nuts .70, for truing the wheel in themanner set forth.

ADRIAN O. ABBOTT.

Witnesses Gi-rAs. T. KING, FRED BARSE.

